rawconference: Set the correct error in fs_raw_session_new_stream.
rawconference: Set the correct error in fs_raw_session_new_stream.

tieto/farstream,tieto/farstream,kakaroto/farstream,shadeslayer/farstream,shadeslayer/farstream,kakaroto/farstream,pexip/farstream,pexip/farstream,tieto/farstream,pexip/farstream,pexip/farstream,shadeslayer/farstream,tieto/farstream,kakaroto/farstream,tieto/farstream,shadeslayer/farstream,kakaroto/farstream